Converting one of blue or green power source (7)

I believe the answer is:

biofuel

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'green power source' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'converting one of blue' is the wordplay.
'converting' indicates an anagram.
'one' becomes 'I' (Roman numeral).
'i'+'of'+'blue'='iofblue'
'iofblue' with letters rearranged gives 'BIOFUEL'.

'or' is the link.

Can you help me to learn more?

(Another definition for biofuel that I've seen is " that avoids putting fossils into power".)

I've seen this clue in The Guardian.

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